基于 PowerMILL 的造型车模五轴加工编程模版开发

探讨造型车模五轴加工工艺要点,研究基于先进CAM软件计算造型车模五轴加工刀具路径编程工艺,提出了对该模型的五轴加工编程工艺规范化思路以及具体实施方案,基于PowerMILL、易语言编程系统开发了造型车模五轴加工编程工艺模版库。     

基于UG结合PowerMILL在螺旋齿轮数控加工中的应用

研究了基于UG结合PowerMILL在螺旋齿轮的数控加工中的应用。讨论了螺旋齿轮的设计和数控加工技术,基于UG完成了零件的CAD设计,利用UG和PowerMILL的接口技术,将三维实体模型导入到PowerMILL中,完成螺旋齿轮的CAM加工编程,并以螺旋齿轮的四轴加工为例加以说明。     

直驱双摆铣头A轴摆动组件加工工艺

基于CAD/CAM一体化技术,对直驱双摆铣头A轴摆动组件进行制造工艺分析,提出采用组合加工、调质后修配关键工位和易变形面的特殊工艺路线。采用Pro/E完成零件的CAD设计,利用Pro/E和PowerMILL的接口技术,将三维模型导入PowerMILL中,完成A轴摆动组件的CAM加工编程及仿真。该方案在现场实际加工中获得了显著效果。     

PowerMILL在模具数控编程中的应用

介绍了PowerMILL的特点、优势、操作方法与步骤,并以相机外壳模具的数控编程为例,详细叙述了编程步骤、加工策略、工艺参数以及仿真效果。     

利用宏对PowerMILL进行快速定制

PowerMILL是一种专业的数控加工编程软件,适用于具有复杂形体的产品、零件及模具的设计制造,实现了CAM系统与CAD系统的分离。我单位购买PowerMILL与其他CAD软件配合使用,使数控加工能力获得了较大提升。但是任何优秀的软件,其功能也不可能满     

面向规范化数控编程系统的设计与研究

针对模具企业数控编程工作没有规范体系、数控编程流程不统一、对数控编程经验依赖性强及优良的加工工艺未得到有效继承等问题,设计出一款规范化数控编程系统。该系统以规范化数控系统为开发目标,研究工艺知识库的构建,建立基于实例与加工规则的综合推理机制,采用PowerMILL二次开发技术开发基于规范化流程设计的数控编程系统,实现工艺数据库与CAM软件的数据交互。结果表明：该系统可有效缩短模具数控编程时间,提高工艺设计和数控加工效率。     

基于PowerMILL的高速切削数控编程策略与应用研究

高速切削是世界制造业中的一项综合性的高新技术。从高速切削的特殊工艺性与自动控制的复杂性出发,阐述了PowerMILL软件所具有的经典加工策略,并通过具体实例研究和分析了基于PowerMILL软件的高速切削NC编程思路、操作方法、工艺处理、NC代码的编辑和调试,实现了一体化作业,更好地适应现代工程需要。     

基于PowerMILL的球面图案模型的五轴加工应用

通过对球面图案模型的加工工艺流程的探讨,研究基于先进CAM技术的球面图案模型的多轴加工刀具路径编程工艺,提出了面向工艺特征、符合工程化概念的该模型五轴编程加工工艺规范化思路及具体实施方案,基于PowerMILL的复杂模型的多轴加工方法能有效地减少加工循环次数、优化刀轨路径,提高了编程效率、加工精度和加工效率.     

汽车覆盖件模具数控加工工艺模板开发及应用

研究了汽车覆盖件模具的工艺结构特征、分类及其加工工艺,基于PowerMILL软件环境开发了汽车覆盖件模具各种结构特征的数控加工工艺及模板,以提高NC编程的质量和效率,规范汽车覆盖件模具加工工艺路线、工艺参数等。实际应用证明了该工艺模板具有可行性和实用性。     

基于PowerMILL的汽车覆盖件模具数控加工工艺模板开发

研究了汽车覆盖件模具加工工艺模板的设计,基于PowerMILL软件以VB.NET为开发平台,利用宏命令对PowerMILL进行二次开发,建立了汽车覆盖件模具的数控加工工艺模板。应用该方法能够有效地减少操作失误,提高生产效率,而且模板的灵活性高,具有较高的实用价值。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.